So just as a warning, people who do social justice sorts of careers usually get paid a lot less than comparably-qualified professionals working in for-profit sectors. They can be very rewarding in other ways, but there are usually just too many highly qualified people willing to take less pay, and a general lack of funding.
But I personally would not discourage exploring them, precisely because that can be a good life even if it is not the most financially lucrative life. And often you can make it at least comfortable as long as you are smart about things like avoiding unnecessary debt, housing costs, and so on.
As far as majors are concerned, it is way too early for that, as others are noting. And in the spirit of being strategic, often if you go into a field where you need a graduate or professional degree, you might be able to get merit or other funding with good enough grades, and then the smartest major is often the one where you will do the best. That sort of thing.